Re: Anyone have a piggy program for memory debugging?
On Thu, 2002-10-10 at 04:35, JB Parrett wrote: > Are you using the Emulator with debug ROMs? Use the latest POSE (3.5) and > the OS 4.1 debug ROMs with all the debug checks turned on and run Gremlins. > POSE does a pretty thorough job of looking for memory accesses in forbidden > places, and the debug ROMs do a good job of checking your use of the Palm OS > APIs through assertions. Yep, I was using the emulator and debug roms. The problem was in one of my assembly line drawing routines. I was getting the base address of a window, and adding the offset for the line something like this: move.l #base, a0| base address for bitmap move.w #rowbytes, d0| bytes per row for this bitmap move.w #row,d1 | row number to start at mulu d1,d0 | multiply them add.w d0,a0 | worked "some" of the time. Assume a0 is 0x11000, and the multiplied offset was 0x3000, no problem, a0 would be 0x14000. Now assume a0 is 0x1E000, and the multiplied offset was 0x3000. now, a0 is actually 0x12000. Because of the way I'd allocated memory, (two big buffers), this would be pointing in the previous buffer, causing a smear effect, but *not* causing a memory violation, even with debug roms. Obviously, that last instruction should have been 'add.l d0,a0'. I just found the right combination of emulator, rom, and pre-loaded programs that helped me tickle this bug to the surface so it could be squashed. It's truly a joy having the emulator so that I *can* debug on so many different devices virtually. > In CodeWarrior, the Palm menu has a Debug Console menu (or something similar > depending on your platform) where you can scramble the heap, compact it, > fill up most free memory, etc. This can also be done in code. Take a look at > the Development Tools Guide chapter on the Console (the guide is in the 5.0 > SDK docs). I'm afraid that Codewarrior is a bit steep for me SRP of $500!?!?. I'm using Falch and PRC Tools. > Finally, take a look at the Expert Case Studies online course, which is free > until the end of the year. Click on the Developers link at > www.palmsource.com and follow the Training links to the course enrollment > form. I've enrolled for this. Thanks! -Ken -- For information on using the Palm Developer Forums, or to unsubscribe, please see http://www.palmos.com/dev/support/forums/
Re: Anyone have a piggy program for memory debugging?
Are you using the Emulator with debug ROMs? Use the latest POSE (3.5) and the OS 4.1 debug ROMs with all the debug checks turned on and run Gremlins. POSE does a pretty thorough job of looking for memory accesses in forbidden places, and the debug ROMs do a good job of checking your use of the Palm OS APIs through assertions. In CodeWarrior, the Palm menu has a Debug Console menu (or something similar depending on your platform) where you can scramble the heap, compact it, fill up most free memory, etc. This can also be done in code. Take a look at the Development Tools Guide chapter on the Console (the guide is in the 5.0 SDK docs). Finally, take a look at the Expert Case Studies online course, which is free until the end of the year. Click on the Developers link at www.palmsource.com and follow the Training links to the course enrollment form. Good luck, JB @ PalmSource on 10/8/02 6:11 AM, kcorey at [EMAIL PROTECTED] wrote: > Hi All, > > I've recently found a bug that didn't surface during initial testing, > because it only appears when my program loads above a certain spot in > memory. > > This means that I need to find (or write) a program that can force my > program to load at a higher place in memory and to test for low-memory > situations. I'm thinking a DA, a hack, or some such terminate and stay > resident program. > > On unix or PC's I've seen these referred to as 'Piggy programs'. > > Does anyone know of such a thing for the Palm? > > Also, anyone know of a program to purposely scramble the stack, slowly > eat up available memory over time, etc? > > -Ken > > > > -- For information on using the Palm Developer Forums, or to unsubscribe, please see http://www.palmos.com/dev/support/forums/
Re: RE: Anyone have a piggy program for memory debugging?
On Tue, 2002-10-08 at 19:52, Hal Mueller wrote: > I'm still trying to figure out what Piggies and 'Roids have in common :) Aside from the fact that 'roids lived up to its name for a day or two because of memory issues, not much... *smile* -Ken -- For information on using the Palm Developer Forums, or to unsubscribe, please see http://www.palmos.com/dev/support/forums/
RE: Anyone have a piggy program for memory debugging?
I'm still trying to figure out what Piggies and 'Roids have in common :) H -- For information on using the Palm Developer Forums, or to unsubscribe, please see http://www.palmos.com/dev/support/forums/
RE: Anyone have a piggy program for memory debugging?
> From: kcorey [mailto:[EMAIL PROTECTED]] > On unix or PC's I've seen these referred to as 'Piggy programs'. > Does anyone know of such a thing for the Palm? http://www.palmoswerks.com/stories/storyReader$28 -slj- -- For information on using the Palm Developer Forums, or to unsubscribe, please see http://www.palmos.com/dev/support/forums/
Re: Anyone have a piggy program for memory debugging?
Hi! > > This means that I need to find (or write) a program that can force my > program to load at a higher place in memory and to test for low-memory > situations. I'm thinking a DA, a hack, or some such terminate and stay > resident program. > Try out Memory Hog (http://www.quantumclockwork.net/memoryhog/index.html). There is also a debug setting in the Palm OS Memory manager (I think the API call is MemSetDebug), that enables some behavior that will break badly written apps earlier on. Cheers, Tilo -- For information on using the Palm Developer Forums, or to unsubscribe, please see http://www.palmos.com/dev/support/forums/
